1: 80 percent / NH3 / methanol / 20 h / -5 - -3 °C 2: 80 percent / POCl3, PO(OMe)3 / 7 h / -5 - 0 °C 3: 58 percent / MnCl2, MgSO4 / formamide / 16 h / Ambient temperature View Scheme

1: 80 percent / NH3 / methanol / 20 h / -5 - -3 °C 2: 80 percent / POCl3, PO(OMe)3 / 7 h / -5 - 0 °C View Scheme